plasma 'tip'

[Creepy]

turn down nozzle tips on a lathe until the hole is round.



works good. electrodes should last longer than nozzles, so this might even it up.

[theonlybull]

kool. never thought to try that :-)

[justajeep]

File or even flap disc will work too. If they get too thin it will blow a big hole in them when you use it.